Donor Acceptor Interactions in the Best Lewis Structure

The localized orbitals in your best Lewis structure
can interact strongly. A filled bonding or lone pair orbital can
act as a donor and an empty or filled bonding, antibonding, or
lone pair orbital can act as an acceptor. These
interactions can strengthen and weaken bonds. For example, a
lone pair donor->antibonding acceptor orbital interaction
will weaken the bond
associated with the antibonding orbital. Conversly, an interaction
with a bonding pair as the acceptor will strengthen the bond.
Strong electron delocalization in your best Lewis structure will
also show up as donor-acceptor interactions.
Interactions greater than 20 kJ/mol for bonding and lone pair
orbitals are listed below.

The interaction of bonding donor orbital, 1, for P1-O2 with
the antibonding acceptor orbital, 138, for P1-O4 is 64.6 kJ/mol.

The interaction of bonding donor orbital, 1, for P1-O2 with
the antibonding acceptor orbital, 139, for P1-O6 is 54.3 kJ/mol.

The interaction of bonding donor orbital, 1, for P1-O2 with
the third antibonding acceptor orbital, 142, for P1-O8 is 326. kJ/mol.

The interaction of bonding donor orbital, 2, for P1-O4 with
the antibonding acceptor orbital, 137, for P1-O2 is 74.4 kJ/mol.

The interaction of bonding donor orbital, 2, for P1-O4 with
the antibonding acceptor orbital, 139, for P1-O6 is 75.8 kJ/mol.

The interaction of bonding donor orbital, 2, for P1-O4 with
the second antibonding acceptor orbital, 141, for P1-O8 is 313. kJ/mol.

The interaction of bonding donor orbital, 2, for P1-O4 with
the third antibonding acceptor orbital, 142, for P1-O8 is 47.8 kJ/mol.

The interaction of bonding donor orbital, 3, for P1-O6 with
the antibonding acceptor orbital, 137, for P1-O2 is 57.4 kJ/mol.

The interaction of bonding donor orbital, 3, for P1-O6 with
the antibonding acceptor orbital, 138, for P1-O4 is 84.9 kJ/mol.

The interaction of bonding donor orbital, 3, for P1-O6 with
the antibonding acceptor orbital, 140, for P1-O8 is 66.3 kJ/mol.

The interaction of bonding donor orbital, 3, for P1-O6 with
the second antibonding acceptor orbital, 141, for P1-O8 is 236. kJ/mol.

The interaction of bonding donor orbital, 3, for P1-O6 with
the third antibonding acceptor orbital, 142, for P1-O8 is 35.0 kJ/mol.

The interaction of bonding donor orbital, 4, for P1-O8 with
the antibonding acceptor orbital, 137, for P1-O2 is 23.6 kJ/mol.

The interaction of bonding donor orbital, 4, for P1-O8 with
the antibonding acceptor orbital, 139, for P1-O6 is 76.4 kJ/mol.

The interaction of bonding donor orbital, 4, for P1-O8 with
the third antibonding acceptor orbital, 142, for P1-O8 is 185. kJ/mol.

The interaction of the second bonding donor orbital, 5, for P1-O8 with
the antibonding acceptor orbital, 138, for P1-O4 is 82.4 kJ/mol.

The interaction of the second bonding donor orbital, 5, for P1-O8 with
the antibonding acceptor orbital, 139, for P1-O6 is 66.8 kJ/mol.

The interaction of the third bonding donor orbital, 6, for P1-O8 with
the antibonding acceptor orbital, 137, for P1-O2 is 98.0 kJ/mol.

The interaction of the third bonding donor orbital, 6, for P1-O8 with
the antibonding acceptor orbital, 140, for P1-O8 is 84.1 kJ/mol.

The interaction of bonding donor orbital, 7, for O2-H3 with
the antibonding acceptor orbital, 140, for P1-O8 is 26.7 kJ/mol.

The interaction of bonding donor orbital, 9, for O6-H7 with
the second antibonding acceptor orbital, 141, for P1-O8 is 34.1 kJ/mol.

The interaction of lone pair donor orbital, 19, for O2 with
the third antibonding acceptor orbital, 142, for P1-O8 is 73.7 kJ/mol.

The interaction of the second lone pair donor orbital, 20, for O2 with
the antibonding acceptor orbital, 139, for P1-O6 is 27.5 kJ/mol.

The interaction of the second lone pair donor orbital, 20, for O2 with
the second antibonding acceptor orbital, 141, for P1-O8 is 30.8 kJ/mol.

The interaction of lone pair donor orbital, 21, for O4 with
the second antibonding acceptor orbital, 141, for P1-O8 is 29.5 kJ/mol.

The interaction of the second lone pair donor orbital, 22, for O4 with
the antibonding acceptor orbital, 139, for P1-O6 is 23.1 kJ/mol.

The interaction of the second lone pair donor orbital, 22, for O4 with
the antibonding acceptor orbital, 140, for P1-O8 is 25.3 kJ/mol.

The interaction of lone pair donor orbital, 23, for O6 with
the third antibonding acceptor orbital, 142, for P1-O8 is 26.1 kJ/mol.

The interaction of the second lone pair donor orbital, 24, for O6 with
the antibonding acceptor orbital, 137, for P1-O2 is 36.1 kJ/mol.

The interaction of the second antibonding donor orbital, 141, for P1-O8 with
the antibonding acceptor orbital, 138, for P1-O4 is 253. kJ/mol.

The interaction of the second antibonding donor orbital, 141, for P1-O8 with
the antibonding acceptor orbital, 139, for P1-O6 is 252. kJ/mol.

The interaction of the third antibonding donor orbital, 142, for P1-O8 with
the antibonding acceptor orbital, 137, for P1-O2 is 356. kJ/mol.

The interaction of the third antibonding donor orbital, 142, for P1-O8 with
the antibonding acceptor orbital, 138, for P1-O4 is 43.0 kJ/mol.

The interaction of the third antibonding donor orbital, 142, for P1-O8 with
the antibonding acceptor orbital, 139, for P1-O6 is 31.2 kJ/mol.

The interaction of the third antibonding donor orbital, 142, for P1-O8 with
the antibonding acceptor orbital, 143, for O2-H3 is 20.3 kJ/mol.